Question

Solve the system of equations algebraically. 4x-3y=8 5x-4y=5

Answer 1

D- (17,20)

Explanation:

I got it right on the quiz

Answer 2

x= 17 and y=20

Explanation:

4x- 3y= 8-------1

5x-4y= 5-------2

Subtracting 2 from 1

5x-4y= 5

-4x+3y=-8

x-y=-3----------3

From 3 we have x= y-3-------4

Putting 4 in 1

4(y-3) -3y= 8

4y - 12 -3y= 8

y= 8+12

y=20------------5

Putting 5 in 2

5x - 4(20)= 5

5x=5+80

5x= 85

x= 17------6